Rt1069
New Member
- Nov 18, 2020
- 20
- Boat Info
- 2001 SeaRay Sundancer 310
- Engines
- 350 Mercruiser 350 Mag MPI Horizon - V Dive
350 Mercruiser 350 Mag MPI Horizon - V Drive
Thursday morning we were cruising out to Block Island from CT, all was good until about 3 hours in I heard a noise from my port engine. Immediately idled down and shut the engine off to check it out.
No change in performance, RPM, oil pressure, temps, anything just the noise. It’s a thumping type sound coming from the intake (spark arrestor). I took a stethoscope to it and from what I can tell it does not sound like it’s something hitting the valve cover but I can hear it if I put the stethoscope on the spark arrestor area.
The boat will be back at my home dock tomorrow so I can dig deeper into it, but I wanted to see if I can get some where to looks first. First plan is remove valve covers and inspect.
300HP 350Mag MPI horizon motor
https://youtube.com/shorts/Yl4RHnd_XWE?feature=share
No change in performance, RPM, oil pressure, temps, anything just the noise. It’s a thumping type sound coming from the intake (spark arrestor). I took a stethoscope to it and from what I can tell it does not sound like it’s something hitting the valve cover but I can hear it if I put the stethoscope on the spark arrestor area.
The boat will be back at my home dock tomorrow so I can dig deeper into it, but I wanted to see if I can get some where to looks first. First plan is remove valve covers and inspect.
300HP 350Mag MPI horizon motor
https://youtube.com/shorts/Yl4RHnd_XWE?feature=share